I think you will find the forums a great resource for information and we look forward to your input on our questions!
Like 'Eric' said - try a search of the "Wheels and Tires" forum or even brouse throught the "Suspensions" pages using present posts or a search to find lots of articles on what tires fit and how they, and other suspension modifications to accommodate larger wheels & tires, could effect the ride/handling of your vehicle.
Here are a few results of a search of the forums for 18" wheels - click on the link to access.
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